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© Melt Miscibility And Mechanical Properties Of Metallocene Linear Low-Density Polyethylene Blends With High-Density Polyethylene: Influence Of Comonomer Type Hussein, IA JOHN WILEY SONS LTD, POLYMER INTERNATIONAL; pp: 1330-1336; Vol: 54 King Fahd University of Petroleum & Minerals http://www.kfupm.edu.sa Summary In this paper, the implications of melt miscibility on the thermal and mechanical properties of linear low-density polyethylene (LLDPE)/high-density polyethylene (HDPE) blends were assessed with respect to the influence of the comonomer type. The influence of the latter was examined by selecting one butene LLDPE and one octene LLDPE of very similar weight-average molecular weight (M-w), molecular- weight distribution (MWD) and branch content, keeping the comonomer type as the only primary molecular variable. Each of the two metallocene LLDPEs was melt- blended with the same HDPE at 190 degrees C in a Haake melt-blender. The rheological, thermal and mechanical properties were measured by the use of an ARES rheometer, differential scanning calorimeter and Instron machine, respectively. The rheological measurements, made over the linear viscoelastic range, suggested no significant influence of the branch type on the melt miscibility. The rheology results are in agreement with those obtained from previous transmission electron microscopy (TEM) and small-angle neutron scattering (SANS) studies. The dynamic shear viscosity and total crystallinity of the metallocene (m)-LLDPE blends with HDPE followed linear additivity. At small strains, the branch type has little or no influence on the melt miscibility and solid-state properties of the blends. Even the large-strain mechanical properties, such as tensile strength and elongation at break, were not Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa
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1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 16. 17. 18. 19. 20. © influenced by the comonomer type. However, the ultimate tensile properties of the HDPE-rich blends were poor. Incompatibility of the HDPE-rich blends, as a result of the weak interfaces between the blend components, is suggested to develop at large strains. (c) 2005 Society of Chemical Industry. References: ALAMO RG, 1997, MACROMOLECULES, V30, P561 BENSASON S, 1997, POLYMER, V38, P3513 BRAHIMI B, 1991, J RHEOL, V35, P1069 CHAUNG CI, 1984, J APPL POLYM SCI, V29, P2205 CHO K, 1989, POLYM ENG SCI, V29, P1969 CHO KC, 1998, POLYM ENG SCI, V38, P1969 CRIST B, 1997, J POLYM SCI POL PHYS, V35, P2329 CROSS MM, 1965, J COLLOID SCI, V20, P417 FREED KF, 1996, MACROMOLECULES, V29, P625 FRIED JR, 2003, POLYM SCI TECHNOL, P179 GARCIAREJON A, 1987, POLYM ENG SCI, V27, P640 GUPTA AK, 1992, J APPL POLYM SCI, V46, P99 HAMEED T, 2002, POLYMER, V43, P6911 HAMEED T, 2004, MACROMOL MATER ENG, V289, P198, DOI 15.10.1002/mame.200300173 HILL MJ, 1997, POLYMER, V38, P5595 HU SR, 1987, J POLYM SCI POL PHYS, V25, P71 HUSSEIN IA, 2000, POLYM DEGRAD STABIL, V68, P381 HUSSEIN IA, 2001, POLYM ENG SCI, V41, P696 HUSSEIN IA, 2003, MACROMOLECULES, V36, P2024, DOI 10.1021/ma0257245 21. HUSSEIN IA, 2004, POLYM ENG SCI, V44, P660, DOI 10.1002/pen.20060 22. HUSSEIN IA, 2004, POLYM INT, V53, P1327, DOI 10.1002/pi.1528 23. HUSSEIN IA, 2004, RHEOL ACTA, V43, P602, DOI 10.1007/s00397-004- 0356-9 24. KARBASHEWSKI E, 1993, J APPL POLYM SCI, V47, P1143 25. LAMANTIA FP, 1985, EUR POLYM J, V21, P811 26. LAMANTIA FP, 1986, EUR POLYM J, V22, P647 27. LEE HS, 2000, POLYM ENG SCI, V40, P1132 28. LEE SY, 1997, POLYM MAT SCI ENG, V76, P325 29. MULLER AJ, 1992, POLYM NETWORK BLEND, V2, P215 30. MUNOZESCALONA A, 1997, POLYMER, V38, P589 31. NESARIKAR AR, 1995, MACROMOLECULES, V28, P7202 32. NUGAY N, 1994, EUR POLYM J, V30, P473 33. RANA D, 1998, J APPL POLYM SCI, V69, P2441 34. REICHART GC, 1998, MACROMOLECULES, V31, P7886 35. SCHOLZ P, 1989, J RHEOL, V33, P481 Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa
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36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. © TANEM BS, 2001, POLYMER, V42, P5389 TASHIRO K, 1992, MACROMOLECULES, V25, P1801 TASHIRO K, 1992, MACROMOLECULES, V25, P1809 TASHIRO K, 1994, MACROMOLECULES, V27, P1221 USAMI T, 1986, MACROMOLECULES, V19, P2722 UTRACKI LA, 1987, POLYM ENG SCI, V27, P1512 UTRACKI LA, 1989, ACS SYM SER, V395, P153 UTRACKI LA, 1991, 2 PHASE POLYM SYSTEM WUNDERLICH B, 1997, THERMAL CHARACTERIZA, V1, P347 YILMAZER U, 1991, J APPL POLYM SCI, V42, P2379 ZHANG M, 2001, POLYMER, V42, P3067 ZHAO Y, 1997, MACROMOL CHEM PHYSIC, V198, P1427 For pre-prints please write to: ihussein@kfupm.edu.sa Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa
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